function getlistitemID(e) 
{
    var e = e || window.event;
    var tgt = e.target || e.srcElement;
    return tgt.id;
}

function seenBtn(e) {
}

function likeBtn(e) {
	likeID = getlistitemID(e);
	blacklistID = likeID.replace("l","b");
	likeCheckBoxStatus = e.currentTarget.checked;
	// possibly, getElementById isn't necessary (get sibling...)
	document.getElementById(blacklistID).disabled = likeCheckBoxStatus;
}

function blacklistBtn(e) {
	blacklistID = getlistitemID(e);
	likeID = blacklistID.replace("b","l");
	blacklistCheckBoxStatus = e.currentTarget.checked;
	// possibly, getElementById isn't necessary (get sibling...)
	document.getElementById(likeID).disabled = blacklistCheckBoxStatus;
}
